test(ci): add golangci-lint

.drone.yml

@@ -9,6 +9,13 @@ steps:
   when:
     event:
       - push
+- name: golangci-linter
+  image: golangci/golangci-lint:v1.59.1
+  commands:
+    - golangci-lint run --enable-all ./...
+  when:
+    event:
+      - push
 - name: vuln-check
   image: golang:1.22.4
   commands:
@@ -40,6 +47,7 @@ steps:
       - push
   depends_on:
     - gofmt
+    - golangci-linter
     - vuln-check
 - name: docker-build
   image: thegeeklab/drone-docker-buildx
@@ -66,6 +74,7 @@ steps:
       - push
   depends_on:
     - gofmt
+    - golangci-linter
     - vuln-check
 - name: bump tag in deployment-repo
   image: git.ar21.de/aaron/kustomize-ci